OFFSET
1,1
COMMENTS
a(6*k+1) + a(6*k+2) + a(6*k+3) + a(6*k+4) + a(6*k+5) + a(6*k+6) = 9*10^k for k >= 1. - Robert Israel, Jul 22 2018
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1) = 2: 0, 1.
a(2) = 1: 64.
a(3) = 1: 729.
a(4) = 1: 4096.
a(5) = 2: 15625, 46656.
a(6) = 3: 117649, 262144, 531441.
a(7) = 5: 1000000, 1771561, 2985984, 4826809, 7529536.
a(8) = 7: 11390625, 16777216, 24137569, 34012224, 47045881, 64000000, 85766121.
MAPLE
r:= proc(n, k) local b; b:= iroot(n, k); b+`if`(b^k<n, 1, 0) end:
a:= n-> r(10^n, 6) -r(10^(n-1), 6) +`if`(n=1, 1, 0):
seq(a(n), n=1..50);
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Alois P. Heinz, Sep 12 2012
STATUS
approved